Ramp-Up Integrator - Siemens SIMOTRAS 6SG7050 Operating Instructions Manual

01.04
9.5.5

Ramp-up integrator

The ramp-up integrator is activated by setting P302 = 1, 2 or 3. After an "ON" command ("Switch-on",
"Inching", "Crawling"), ramp-function generator setting 1 (P303 to P306) is applied until the ramp-
function generator output reaches the required setpoint for the first time.
The remaining sequence of operations is controlled by the "Enable switchover of ramp-up integrator"
function (binector selected in P646).
Enable switchover of ramp-up integrator = 1:
As soon as the ramp-function generator output reaches the required setpoint for the first time after
the "ON" command, the ramp generator setting selected in P302 is activated automatically.
Enable switchover of ramp-up integrator = 0:
Ramp-function generator setting 1 (P303 to P306) remains active after the generator output has
reached its setpoint until the "Enable switchover of ramp-up integrator" function is switched to 1.
The ramp generator setting then changes to that selected in P302.
When the enable signal for ramp-up integrator switchover is cancelled (→ 0), ramp-function generator
setting 1 is activated again and, with a new enable command (→ 1), this setting continues to remain
active until the generator output has reached its setpoint again. The ramp generator setting selected in
P302 is then activated again.
When a "Shutdown" command is given, the drive is shut down according to setting 1.
Note:
Activation of "Ramp-function generator setting 2" (P307 to P310, selected in P637), or "Ramp-function
generator setting 3" (P311 to P314, selected in P368), has priority over the generator setting selected
by means of the "Ramp-up integrator" function.
9.5.6 Ramp-function generator tracking
The ramp-function generator output (K0190) is limited to the following values when ramp-function
generator tracking is activated:
− ∗
I
, A lim it
K
p
n
act
+ I
A, limit
– I
A, limit
K
p
However, if the value added to n
added.
The purpose of the "Ramp-function generator tracking" function is to ensure that the ramp generator
value cannot deviate excessively from the actual speed value once the current limit has been reached.
Note:
When ramp-function generator tracking is selected, the filter time for the speed setpoint should be set
to a low value in P228 (preferably to 0).
9.5.7 Limitation after ramp-function generator
Since the input signal can be freely selected, this limiter stage can be used completely independently
of the ramp-function generator.
A special feature of this limiter is that the lower limit can also be set to positive values and the upper
limit to negative values (see P300 and P301). This type of limit setting then acts as a lower limit
(minimum value) for the ramp generator output signal in the other sign direction.
Example: P632.01-04 = 1 (= 100.00%)
P300 = 100.00 (%)
P301 = 10.00 (%)
P633.01-04 = 9 (= -100.00%)
results in a limitation of the value range for K0170 to between +10.00% and +100.00%
SIEMENS AG 6SG7000-0BA76
SIMOTRAS HD Operating Instructions
. 1 25
+ <
n RFG output
act
Actual speed value (K0167)
Lowest positive current limit (K0131)
Lowest negative current limit (K0132)
Effective speed controller gain
were to correspond to less than 1%, then +1% or –1% would be
act
+ ∗
I . 1 25
, A lim it
< +
n
act
K
p
Function descriptions
9-17